The process can not access the file because it is being used by another process

Question

Hi friends,

I am creating one small application.

In that I am sending the mail with attachments.

After sending the mail I want to move that attachment files (present on hard drive) to another location in my hard drive.

But whhen I do this, it gives me the exception as shown below,

The process can not access the file because it is being used by another process.

To solve this problem I have written the following code:

 

 private void SendPreviousUnsentFiles()

{

string status = Emailer.SendMessageWithAttachment(sendTo, sendFrom, sendSubject, sendMsgBody, sendAttachments);

            

            if (status.Equals("101"))

            {

                //System.Threading.Thread.Sleep(50000);

                System.DateTime dt = System.DateTime.Now + new TimeSpan(0, 5, 0);

                foreach (string strFile in sendAttachments)

                {

                    try

                    {

                        string strFileName = strFile.Substring(strFile.LastIndexOf('\\'));

                        //while (FileInUse(strFile))

                        //{

                        //    Thread.Sleep(1000);

                        //    if (dt < System.DateTime.Now)

                        //    {

                        //        MyMessageBox.ShowBox("Original report files not moved to sent items.", "Email  Status", MyMessageBox.MyMessageBoxButton.OK, MyMessageBox.MyMessageBoxIcon.Information);

                        //        return;

                        //    }

                        //}

                        File.Move(strFile, LocalResources.processedInfoDirectory + "Sent Mails" + strFileName);

                    }

                    catch (Exception ex)

                    {

                        MyMessageBox.ShowBox("Error in moving file due to " + ex.Message, "Error", MyMessageBox.MyMessageBoxButton.OK, MyMessageBox.MyMessageBoxIcon.Error);

                    }

                }

                status = "Old De-identification status reports successfully sent to " + sendTo + " at " + System.DateTime.Now.ToString() + ".";

                MyMessageBox.ShowBox(status, "Email Status", MyMessageBox.MyMessageBoxButton.OK, MyMessageBox.MyMessageBoxIcon.Information);

            }

            else

            {

                MyMessageBox.ShowBox(status, "Email Status", MyMessageBox.MyMessageBoxButton.YesNo, MyMessageBox.MyMessageBoxIcon.Error);

            }

}

static bool FileInUse(string path)

{

            try

            {

                //Just opening the file as open/create

                using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate))

                {

                    //If required we can check for read/write by using fs.CanRead or fs.CanWrite

                }

                return false;

            }

            catch (IOException ex)

            {

                //check if message is for a File IO

                if (ex.Message.ToString().Contains("The process cannot access the file"))

                    return true;

                else

                    throw;

            }

        }

But it is taking lot of time to do the processing (moving).

Please help me to resolve this problem.